
 Component \(g_1\) : [1]} and [2]} evidenced a region of high excitation of \(\approx 10\)  size, with a kinetic temperature
\(T_{\rm kin}\approx 200\hbox{\hspace{1.99997pt}K}\)  and gas density \(n(\hbox{H${}_2$})\simeq 10^6\hbox{\hspace{1.99997pt}cm$^{-3}$}\) . This region is associated with the impact of the jet against the L1157-B1 bow shock.

 Component \(g_2\)  is tracing the outflow cavity associated with L1157-B1, for which a kinetic temperature \(T_{\rm kin} \approx 60\hbox{\hspace{1.99997pt}K}\)  and a gas density \(n(\hbox{H${}_2$})\simeq \)  (1–10)\(\times 10^5\hbox{\hspace{1.99997pt}cm$^{-3}$}\)  were estimated.

 Component \(g_3\)  is tracing the late outflow cavity associated with L1157-B2, for which have been estimated \(T_{\rm kin}\approx 20\hbox{\hspace{1.99997pt}K}\)  and \(n(\hbox{H${}_2$})\simeq 10^5\hbox{\hspace{1.99997pt}cm$^{-3}$}\)

  A hot (\(T_{\rm kin}\simeq 1000\hbox{\hspace{1.99997pt}K}\) ) and tenuous gas component (\(n(\hbox{H${}_2$})\simeq 10^3-10^4\hbox{\hspace{1.99997pt}cm$^{-3}$}\) ) with a size of 2 -

